I have an item in my sent folder that won't delete. It's happened before & I've eventually been able to get rid of them, but this one that's in there now won't budge.  It says "an unknown error has occurred."  I saw an answer to this to go to your web mail & delete it there, but when I did that, it's not there.  It's just on my Windows Live. How do I get rid of this dang thing?

Original title: Windows Live email issue